If you are one of those who are hard to adapt to the footprints of such horizontal and improvised thinkers, you've come to the right place.This e-book focuses on exploring the various ways of understanding critical concepts and analyzing their various aspects and implementing it and getting all the benefits. We also provide detailed information about the problem-solving (the problem we are facing and how to use it). This book lists several examples, these examples can help you better understand the situation. Problem-solving, critical thinking and decision-making are closely related. Only through critical thinking and decision-making can determine the solution of the problem. These problems may be small or large.However, the problem-solving process is absolutely certain, and helps to determine the solution easily.